/* ========= Theme Variables — aligned with Warnings.Web.React ========= */
:root,
[data-theme="light"] {
  --bg-primary: #f8f9fb;
  --bg-secondary: #f0f2f5;
  --bg-tertiary: #e8ebf0;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-hover: #ebedf1;

  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;

  --border-primary: #dfe2e8;
  --border-focus: #3b82f6;

  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;

  --status-success: #16a34a;
  --status-success-bg: #dcfce7;
  --status-error: #dc2626;
  --status-error-bg: #fee2e2;
  --status-warning: #d97706;
  --status-warning-bg: #fef3c7;
  --status-info: #2563eb;
  --status-info-bg: #dbeafe;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
}

[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #161b22;
  --bg-input: #21262d;
  --bg-hover: #30363d;

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --text-inverse: #0d1117;

  --border-primary: #30363d;
  --border-focus: #58a6ff;

  --accent-primary: #58a6ff;
  --accent-primary-hover: #79b8ff;

  --status-success: #3fb950;
  --status-success-bg: #0d2818;
  --status-error: #f85149;
  --status-error-bg: #3d1114;
  --status-warning: #d29922;
  --status-warning-bg: #2e1e05;
  --status-info: #58a6ff;
  --status-info-bg: #0c2d6b;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

/* ========= Reset & Base ========= */
*, *::before, *::after { box-sizing: border-box; }

html {
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.2s, color 0.2s;
  display: flex;
  flex-direction: column;
}

/* ========= Scrollbar ========= */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ========= Typography ========= */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 0;
}

a { color: var(--accent-primary); text-decoration: none; }
a:hover { color: var(--accent-primary-hover); text-decoration: underline; }

hr {
  border: none;
  border-top: 1px solid var(--border-primary);
  margin: 1rem 0;
}

/* ========= Layout Shell ========= */
.site-header {
  height: 56px;
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  flex-shrink: 0;
}

.site-header .brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-header .brand:hover { text-decoration: none; color: var(--text-primary); }
.site-header .brand svg { color: var(--accent-primary); }

.site-header nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1.5rem;
}

.site-header nav a {
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: background-color 0.15s, color 0.15s;
}

.site-header nav a:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  text-decoration: none;
}

.site-header .spacer { flex: 1; }

.site-header .actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-content {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.site-footer {
  border-top: 1px solid var(--border-primary);
  padding: 0.75rem 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

/* ========= Card ========= */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

/* ========= Buttons ========= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
  white-space: nowrap;
  text-decoration: none;
  line-height: 1.5;
  font-family: inherit;
}

.btn:hover { text-decoration: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn:focus { outline: none; box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25); }

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
  border-color: var(--accent-primary);
}
.btn-primary:hover:not(:disabled), .btn-primary:focus:not(:disabled) {
  background-color: var(--accent-primary-hover);
  border-color: var(--accent-primary-hover);
  color: var(--text-inverse);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-primary);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-hover);
}

.btn-danger {
  background-color: var(--status-error);
  color: #fff;
  border-color: var(--status-error);
}
.btn-danger:hover:not(:disabled) { opacity: 0.9; }

.btn-success {
  background-color: var(--status-success);
  color: #fff;
  border-color: var(--status-success);
}
.btn-success:hover:not(:disabled) { opacity: 0.9; }

.btn-outline-primary {
  background: transparent;
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}
.btn-outline-primary:hover {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent-primary);
  padding: 0;
  font-weight: 400;
  cursor: pointer;
}
.btn-link:hover { color: var(--accent-primary-hover); text-decoration: underline; }

.btn-sm { padding: 0.25rem 0.625rem; font-size: 0.8125rem; }
.btn-lg { padding: 0.625rem 1.25rem; font-size: 1rem; }

/* ========= Form Controls ========= */
.form-control, .form-select {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-family: inherit;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-input);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus, .form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
}

.form-control::placeholder { color: var(--text-tertiary); }

.form-floating > .form-control::placeholder { color: transparent; }
.form-floating > .form-control:focus::placeholder { color: var(--text-tertiary); }

.form-floating {
  position: relative;
}

.form-floating > .form-control {
  height: calc(3rem + 2px);
  padding: 1.25rem 0.75rem 0.375rem;
}

.form-floating > label {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0.75rem;
  pointer-events: none;
  transform-origin: 0 0;
  transition: opacity .15s ease-in-out, transform .15s ease-in-out;
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label {
  transform: scale(0.75) translateY(-0.375rem);
  opacity: 0.75;
  color: var(--accent-primary);
}

.form-label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-check-input {
  width: 1rem;
  height: 1rem;
  border: 1px solid var(--border-primary);
  border-radius: 3px;
  background-color: var(--bg-input);
  appearance: none;
  cursor: pointer;
  flex-shrink: 0;
  margin: 0;
}

.form-check-input:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/%3e%3c/svg%3e");
  background-size: 0.75rem;
  background-repeat: no-repeat;
  background-position: center;
}

.form-check-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
}

/* ========= Validation ========= */
.text-danger, .validation-message, .field-validation-error {
  color: var(--status-error);
  font-size: 0.8125rem;
  margin-top: 0.25rem;
}

.validation-summary-errors {
  background: var(--status-error-bg);
  border: 1px solid var(--status-error);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  color: var(--status-error);
  font-size: 0.875rem;
}

.validation-summary-errors ul { margin: 0; padding-left: 1.25rem; }

.input-validation-error { border-color: var(--status-error) !important; }

/* ========= Alerts ========= */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  border: 1px solid;
}

.alert-success { background: var(--status-success-bg); border-color: var(--status-success); color: var(--status-success); }
.alert-danger  { background: var(--status-error-bg);   border-color: var(--status-error);   color: var(--status-error); }
.alert-warning { background: var(--status-warning-bg); border-color: var(--status-warning); color: var(--status-warning); }
.alert-info    { background: var(--status-info-bg);    border-color: var(--status-info);    color: var(--status-info); }

.alert-dismissible { position: relative; padding-right: 2.5rem; }
.alert-dismissible .btn-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0;
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: inherit;
  opacity: 0.7;
  line-height: 1;
}
.alert-dismissible .btn-close::after { content: '\00d7'; }
.alert-dismissible .btn-close:hover { opacity: 1; }

/* ========= Nav Pills (Manage sidebar) ========= */
.nav-pills {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.nav-pills .nav-link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: background-color 0.15s, color 0.15s;
}

.nav-pills .nav-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  text-decoration: none;
}

.nav-pills .nav-link.active {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
}

/* ========= Theme Toggle ========= */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: background-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ========= Auth Pages (Login/Register) ========= */
.auth-container {
  max-width: 420px;
  margin: 2rem auto;
}

.auth-container .card { padding: 2rem; }

.auth-container h1 {
  font-size: 1.5rem;
  text-align: center;
  margin-bottom: 0.25rem;
}

.auth-container .auth-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.auth-container .form-floating + .form-floating { margin-top: 0.75rem; }

.auth-container .btn-primary.auth-submit {
  width: 100%;
  padding: 0.625rem 1rem;
  font-size: 0.9375rem;
  margin-top: 1rem;
}

.auth-container .auth-links {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.auth-container .auth-links a { font-weight: 500; }
.auth-container .auth-links p { margin: 0.375rem 0; }

/* ========= Manage Pages ========= */
.manage-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 768px) {
  .manage-layout {
    grid-template-columns: 1fr;
  }
}

.manage-sidebar .card { padding: 0.5rem; }
.manage-content .card { padding: 1.5rem; }

/* ========= Tables ========= */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.table th {
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-primary);
  background: var(--bg-secondary);
}

.table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-primary);
}

.table tr:hover td { background: var(--bg-hover); }

/* ========= Utility ========= */
.w-100 { width: 100%; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1.5rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-tertiary); }
.d-flex { display: flex; }
.gap-2 { gap: 0.5rem; }

/* ========= QR Code (2FA) ========= */
#qrCode { margin: 1rem 0; }
#qrCode img { max-width: 200px; }